A.0.2% B.0.5% C.0.7% D.1.0%
A.每打入土層20cm的錘擊數(shù) B.每打入土層30cm的錘擊數(shù) C.每打入土層40cm的錘擊數(shù) D.每打入土層50cm的錘擊數(shù)
A.①②③④⑤ B.①②③⑤ C.①②④⑤ D.①②③④